<template>
  <div class="todo-header">
      <input type="text" placeholder="请输入你的任务名称，按回车确认" v-model="title" @keyup.enter="add"/>
  </div>
</template>

<script>
import {nanoid} from 'nanoid'
export default {
  name: "MyHeader",
  data(){
    return{
      title:''
    }
  },
  methods:{
    add(){
      //校验数据
      if(!this.title.trim()) return alert("输入框不能为空！！！")
      //将用户的输入信息包装称一个对象
        const todoobj = {id: nanoid(), title: this.title, done: false}
       //通知app组件添加一个数据
      this.$emit('addtodo',todoobj)
        //清空输入框
        this.title = ''

    }
  }
}
</script>

<style scoped>
  .todo-header input{
    width: 560px;
    height: 28px;
    font-size: 14px;
    border: 1px solid #f3dfdf;
    border-radius: 4px;
    padding: 4px 7px;
  }
  .todo-header input:focus{
    outline: none;
    border-color: rgba(82,168,236,0.8);
    box-shadow: inset 0 1px 1px rgba(0,0,0,0.075),0 0 8px rgba(82,168,236,0.8) ;
  }

</style>